add math.lua, move all math related helpers in to it

frontend/math.lua

@@ -0,0 +1,25 @@
+--[[
+Simple math helper function
+]]--
+
+function math.roundAwayFromZero(num)
+	if num > 0 then
+		return math.ceil(num)
+	else
+		return math.floor(num)
+	end
+end
+
+function math.round(num)
+	return math.floor(num + 0.5)
+end
+
+function math.oddEven(number)
+	if number % 2 == 1 then
+		return "odd"
+	else
+		return "even"
+	end
+end
+
+